"Roman century organisation" Topic

A roman (legionary or auxiliary) century around 150 AC consisted of about 80 men organised in 10, 8 men strong contubernium (contabernia ?).
A century had a centurion plus often an optio.
But, had the century also a hornplayer/musician and a signifier and if yes, what kind of signum for a century?

Definitely at least a standard for the maniple ( centuries paired into maniples) and probably the century as well but no one really knows for certain. Been doing a bit of research on the subject myself as making a range of Ceasarian Romans.
Musicians again no one really knows for sure but more than likely. Im doing 20 legionari, horn player, 'trumpet player, Optio, Standard bearer and Centurion in my cohorts.
As for the type of standard again its nobody knows. Possibly some system of the standards bits and bobs denoting centuries, cohorts.
Hope thats some help Id just go with using whatever figures the make you decided upon provide really.
L

The reason i asked is, that I want to wargame a fictitious Roman border castella in the mid 2nd century with it's garrison of max a cohort (Probably a cohors equitata zo I can have auxiliary infantry and cavalry). So my basic unit will be the century of 20 figures (or scale of 1:4).

Corhors Equitata would have standard sized infantry centurae with additional, seperate, turmae of cavalry, ie not mixed in the century

I must been unclear but I want to portray a border castella with the cohors quingenaria consisting of 120 cavalry (4 turmae) and 480 auxiliary infantry (6 centuries). The century or turmae will be the basic units.